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[Qemu-devel] [Bug 1603734] Re: Hang in fsqrt


From: Ziyue Yang
Subject: [Qemu-devel] [Bug 1603734] Re: Hang in fsqrt
Date: Wed, 14 Dec 2016 13:07:59 -0000

Bug fixed showed by https://github.com/unicorn-engine/unicorn/pull/609
and the test case shows no problem on the most recent release. 

** Changed in: qemu
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1603734

Title:
  Hang in fsqrt

Status in QEMU:
  Fix Released

Bug description:
  At least qemu-i368 and qemu-x86_64 hang in floatx80_sqrt in versions
  2.6.0 and git (2.6.50) for some input values, likely due to an
  infinite loop at fpu/softfloat.c:6569.

  Steps to reproduce:
  1) Compile attached code: gcc -o test test.c -lm
  2) `qemu-i368 test` and `qemu-x86_64 test` will hang at 100% cpu

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